Valve seat reamer sleeve



April 11, 1933. H. c PRESTON v 1,903,533

VALVE SEAT REAMER SLEEVE Filed June 16', 1931 r? I i 4/ 1 IL] 159 19 I. /J5/ 1a I 16 iD-- i r j 11 1 i i? 0 5 55% j l 1 12% f, I 7 I W? I rgi C za/\'\ zz Patented Apr. 11, 1933 T Z A S H NRY, c. rnnsron, or BALTIMORE COUNTY, A YL Ase-a algam BLACK & nnoxnn mxnumcrunmeoonmmv, or 'I'OWSQN, MARYLAND, a oonronn'r on or MARYLAND Application filed June 1'6,

In the resurfacing of valve seats, the customary practice isto use ahand reamer to remove the hard surfacewhich forms on'the seat during the operation of the motor and to further cut away the main'part of the metal,

ing." In this way it is attempted to keep the cut of the reamer which,in eifejct, forms'the new valve seat, in aligmnentwith the valve stem guide with the object of centering the new seat or new seating surface and aligning it with the valve stem guide.

It hasbeen'jfound tha't a:certain amount of wear takes place as to the inner surface of the sleeve and the outer surface 'ofthe arbor or pilotas the'sleeve is rotated upon it in operating the cutter. In fact, a satisfactory result cannot be obtained under existing conditions without the exercise of unusualskill and diligence owing to the difficulty in so controlling the reamer cut as to cause the seating surface which is finally produced to be exactly centered, and aligned with the valve stem guide. This is largely due to the wear of the contacting surfaces of the sleeve and arbor .P V

at 6, the split which maybe intheform of a' saw cut, extendingfrom the outersurfaceinwardly tothe centralbore 5. In the form f or pilot.

To overcome these difficulties and produce a valve seat reaming apparatus whereby the new seating surface can be properly and exactly centered without variation and without the exercise of greater skill and diligence than that which is to be expected of the average mechanic engaged in the repair of motor vehicles and the like, is the object of the invention. To this end the invention provides E an adjustable sleeve or hubfor supporting the reamer on the pilot whereby any and all wear of the contacting surfaces of the reamer sleeve and-pilot which may occur can be. taken, up,

v causing the reamer to be properly-centered t with the pilot' at all times .The adjustable sleeve is also claimed in combination with a pilot which may include centering means; at

4 wF-igure 3 is atop plan view;of the same,

central bore or opening 5, to receive the arbor ,vALvn sna'r REAMER sLnnvn i931. Serial ms.- 544,808.

the top and bottom of the gu In the accompanying: drawingI have -trated a valve' 'seat reamer with means for mountlng thesame on the pilot or, arborand I means for centering the pilot, in accordance with my invention in thepreferred form;

Inithe drawing:

Figure 1 is a section including the axis of awvalve guide showing the arbor, the sleeveland the reamer assembled and inoperative relation thereto, in accordance, with the invention.

Figure 2 is'an sleeve or hub. p

"Figure 4; is a sectionon the-lined, {i in Figure 1. y e 1 1 Referring to the drawing by numerals, each of which. is used to indicate thesame or similanparts in the different figures, the valve seatreaming apparatus as shown comprises an arbor or pilot 1, adapted to fit in the valve guide or bushing 2 and a valve seat reamer 3 with a sleeve or hub i carrying g the reamer and mounted to rotate onthe pilot orarborl, l In accordance with the preferred form, of

the inventiomthe sleeve orhub' i, which has a elevation of the reamer r ide to takelup I i 1, is slotted or, split preferably in a; radial lane or substantially in line with a radius shown the cut or split (i -terminates shortof the lower end at 8 and the-lower portion of the sleeve isshown as tapered at 7-to provide aseat for the reamer. In the formgshown Lthe cutorsplit, also extends a short distance intothe wall of the sleeveat 9 on the opposite side of the borekfrom thecut 6. 1 This ,on thisthread is seated a nut 11- preferably hexagonal which isused to back-the reamer io io t e s e w n i is es dj to ch n 'gives additional'fiexibility tov the-sleeveeinthe reamer for a different size or for any purpose, it being understood that to seat the reamer in operative relation to the sleeve, it is forced on to the taper to cooperate with which it has a correspondingly tapered opening indicated at 12 in Figure 1 Above the threaded portion 10, the sleeve is formed with a projecting shoulder or collar 14:, which may be integral with the sleeve. The shoulder is shown as hexagonal or square as to its horizontal cross section so that it is conveniently engaged by means of any suitable wrench to rotate the reamer in the cutting operation. This collar is shown as bored at 15 at right angles to the cut or split 6, crossing the same outside ofthe circular arbor opening 5, and in this hole15 which is threaded for this purpose is seated a clamping screw 16' for adjusting the size of the sleeve opening 5'to a neat running fit onthe pilot as hereinafter described by closing the split 6 as desired.

The form of the arbor-orr pilot is also of interest. Ata pointspaced downwardly from the upper end' by a distance whichmay be equal to or a little greater than the length of the reamer sleeve 4=is a downwardly tapered frustro conical shoulder 17 of relatively gradual taper and the lower end portion of the arbor is tapered downwardly from the diameter of thecentral portion at 18 which fits loosely withinthe valve guide 2 to arelatively small screw threaded lower end at 19,

the taper being indicated by reference character 20. The tapered shoulder 17 and the taper 20 are preferably so spaced that in'the operative position of the parts they come at the upper and lower ends, respectively, of

the valve guide or bushing 2. Cooperating with the lower end of the pilot 1 is a split threaded centering tip 21. This tip is formed externally of a diameter normally somewhat less than the valve guide or bushing with which the apparatus is to be used.

The tip'is provided with an enlarged tubular portion 22 extending upwardly and having an opening at 2 1' corresponding to the taper at 20 and adapted to admit the tapered portion to be expanded thereby. This portion 22 is split radially and longitudinally at 23 to provide for expansion of the portion 22 in contact with the taper 20 on the pilot.

screwed up on the threaded end 19 by turn- Letters Patent is: .ff

ing the pilot by means of a pin inserted through opening 28 at the top, forcing the taper 20 on the pilot into the opening 24 in the tip until the expansion of the tip and the spreading of the split 23 due to contact of the'tubular extension 24' with-the taper 20 causes the outside. of the tubular portion 22 to contact and engage closely With the walls of the valve stem guide. In this way the pilot or "arbo'r'is definitely centered. and rigidly clamped in'the valve ste'mguideQ A .suitablereamer or cutter 3 having been pressed on to'the taper 7 of the sleeve 4, the sleeve carrying the reamer or cutter is passed over the top end of the pilot so that it comes in contact with the valve 'sea'tlto be repaired or reamed at 27 Then the screw 15 is tightened closing the "cut, 6,11ntil' the} sleeve has a neat fit on the pilot andcan be rotated without. any suggestion of sideplay. This-adjustment'of the. sleeve 4 to the pilot 'disposes of any tendency on the part of the reamer to cut off center due to wear of the contacting surfaces of the sleeve and pilot. The pilot being rigidly supported in and duly central With the valve guide in the manner described, or in any suitable manner as by. use of; any type of pilot ,which fitsclosely in' the valve guide, the .reamer cut ispositively; centered in wear of the various parts'and without the exercise of-"unusual' skill 'on'the part of the operator.- H

I have thus described specificallyand in.

reamer, pilot andsleeve, embodying the features of my invention in the preferred form, the description being specificand in detail in order that the manner of applying the invention and constructing andoperating and usin the same may be fully understood, however, the specific terms thereinare used descriptively rather than in a limiting sense, the scope of the invention being defined'in the claim. What Iiclaim as new and desire toi'secu'r'e by A valve seat reamer sleeve adapted to "carry a reamer, the samebeing tapered at its lower end to form an arbor for the reamer, the central aperture of the sleevebeing adapted to, engage a valve seat surfacing pilot, the sleeve immediately above the taperbeing threaded and provided with a nut for backing the A reamer off the seat, the sleeve being slotted in relation to the valve guide without regard to 395 vdetail a device for centering, a valve seat the direction of the axis for. substantially its entire length downwardly to :a point; approaching the lower end of-the taper, the slot extending upwardly to and through the. upper M end of the sleeve, the sleeve being provided immediately above the backing ofl thread with an angular slotted collar for engage ment'with a handle or wrench, said collar being bored in a directionwhich is substantially tangentialto the pilot, and threaded to receive a screw which engages the sleeve on both sides of the slot and a screw in said bore for adjusting the diameter of the sleeve to the pilot. a

Signed by me at Towson, Baltimore County, Maryland, this 9th day of June,

HENRY C. PRESTON. 

